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Background and fundamentals
A credit card lets you borrow for purchases up to a limit set by the issuer. As you repay the balance, that credit becomes available again. Each month, your statement shows what you owe, the minimum payment and the payment deadline.
You can usually avoid purchase interest by paying the full statement balance on time each month. The conditions depend on the card, including whether you cleared the previous statement. Cash withdrawals are treated differently.
The annual percentage rate (APR) expresses the yearly cost of borrowing, including interest and compulsory charges such as an annual fee. Rates vary by card and borrower, so check the rate offered to you. A 0% purchase offer waives purchase interest for a set period; the standard purchase rate applies to any remaining balance after it ends.
The minimum payment is the amount you must pay by the due date. Its calculation varies by issuer and commonly includes interest, fees and a percentage of the balance, with a minimum cash amount. Paying only that amount can leave even a £1,000 debt at 20% APR outstanding for years. MoneyHelper explains why minimum repayments can prolong a debt.
Why banks offer credit
Card issuers earn money from interest, cardholder fees and payments generated when customers use their cards. Annual fees, late-payment charges and cash-advance fees are among the charges described in Bankrate's overview of issuer income.
A customer who clears the balance every month can still generate revenue. In a typical card payment, the retailer pays its bank a merchant service charge. Part of that charge covers interchange, a payment from the retailer's bank to the card issuer. Network fees are separate from interchange.
For consumer credit-card transactions covered by the UK interchange cap, the maximum is 0.3% of the transaction value. The cap applies where the merchant, its bank and the card issuer are all in the UK; some transactions and card arrangements fall outside it. The Payment Systems Regulator explains the scope. The retailer's total card-acceptance charge can be higher.
A card account can also lead a customer to use the bank's loans or other accounts. Banks weigh this business against the risk of unpaid debt and the capital they must hold against lending.
How credit cards work
When you pay by card, the retailer's payment provider asks the issuer to authorise the transaction. Once it is processed, the purchase is added to your balance. Your monthly statement records the previous balance, new transactions, payments and credits, alongside the new balance and the minimum due.
Pay at least the minimum by the deadline. Paying more reduces the balance faster. A missed or late payment can lead to a fee and a negative entry on your credit file, which may make future borrowing harder or more expensive.
If you do not meet the conditions for interest-free purchases, interest is usually calculated daily and can run from when each transaction is added to the account. It is not necessarily charged only on the amount left after the payment deadline. Chase's published terms illustrate this and explain why interest accrued between a statement date and repayment can appear on the following statement.
Purchases, balance transfers and cash withdrawals can have different interest rates. Cash withdrawals usually attract a fee and interest from the outset. A balance transfer moves debt from another card and may offer a promotional rate, but often carries a transfer fee. HSBC explains these common charges.
Consumer protections and incentives
Under Section 75 of the Consumer Credit Act 1974, a qualifying credit-card purchase can make the issuer jointly responsible with the supplier for breach of contract or misrepresentation. The cash price of the item or qualifying set must be more than £100 and no more than £30,000. This is the purchase price, not the amount paid on the card.
Paying only a deposit by credit card can therefore protect the whole qualifying purchase. A claim might arise if goods are faulty, a service was misrepresented or a supplier fails to deliver after going out of business. How you pay and any intermediary involved can affect eligibility, as the Financial Ombudsman Service explains.
Debit cards do not carry Section 75 protection. Chargeback is a separate card-scheme process that can help recover payments made by debit or credit card. It has its own rules and time limits. MoneyHelper sets out how the two protections work.
Some cards offer cashback or points redeemable for travel or gifts. A 1% cashback rate returns £1 for each £100 of eligible spending. Rewards can add value when you clear the balance, but interest and fees can outweigh them.
Issuers report account and payment information to credit reference agencies. A history of paying on time can support future credit applications; missed payments can harm them. Lenders assess your credit record alongside other information and apply their own criteria, so using a card does not guarantee a better score or approval.
You do not need a credit card to build a credit history. Loans and some service accounts can also contribute. Having little recorded credit history can make it harder for a lender to judge how you manage borrowing. MoneyHelper explains what appears on a credit report.
Comparative analysis
The balance between cost and benefit depends on what you buy and how you repay it.
- Cost of credit: In an illustrative calculation, a £1,000 balance at 20% APR repaid in 12 equal monthly instalments costs about £102 in interest. This assumes equal monthly interest periods, no fees or further spending, and interest from the start. Paying from available cash or by debit card avoids that borrowing cost. Minimum repayments can extend the debt for years. For a larger purchase, compare the total cost and repayment term with a personal loan.
- Interest-free purchases: A card can let you delay paying for a planned purchase without purchase interest, provided you meet its repayment conditions. You also get a transaction record and any applicable purchase protection. Check annual, foreign-transaction and other fees before treating it as cost-free.
- Rewards and incentives: At 1% cashback, £1,000 of eligible spending earns £10. Using a rewards card for ordinary spending, such as groceries or bills that accept cards, can produce a small saving if you clear the balance. Compare the reward with any annual fee and the cost of borrowing. Spending more to earn rewards defeats the saving.
- Convenience and protection: Cards are widely accepted, and a lost card can be blocked. Unauthorised credit-card payments generally qualify for a refund; report them promptly to the issuer. The FCA explains the rules and exceptions. These protections can be useful for online shopping and travel. Section 75 can also cover qualifying larger purchases and holidays when only a deposit is paid by card.
- Building credit: Small, regular purchases that you repay on time can help establish a borrowing record. Debit-card purchases do not record repayments of borrowed money, although an associated overdraft can appear on your credit file.
- Emergency use: Available credit can cover an unexpected car repair or medical bill, but it creates a debt that needs a repayment plan. Compare the cost with accessible savings, a lower-cost overdraft or borrowing from a credit union where those options are available.
- When to avoid or be cautious: A card can be expensive for speculative purchases or spending you cannot budget to repay. Uncertain income, irregular spending and relying on minimum payments increase the risk of debt building up. A high APR makes a carried balance more costly. UK retailers generally cannot add a surcharge simply because you pay with a consumer credit or debit card; the Payment Systems Regulator explains the ban.
Discussion
Credit cards can help with short-term cash flow and provide purchase protection. Rewards may reduce the cost of spending you already planned. Those benefits become less useful when a card regularly funds spending beyond your income and the balance keeps growing.
In May 2025, Credit Strategy reported Equifax findings on rising card debt. Equifax's Paul Heywood said consumers increasingly used cards for routine spending and warned that debt growth had outpaced wages since the pandemic.
Wider access to credit can make payments and short-term budgeting easier. It also leaves households exposed to interest costs when income falls or bills rise. Include card repayments in the household budget before committing to new spending.
UK lenders must assess creditworthiness, including affordability, and communicate clearly about the credit they offer. The FCA sets out these responsibilities. Compare APRs and fees, read the terms and use a repayment calculator to work out what a balance will cost. MoneyHelper's credit-card guide links to tools that can help.
A credit card is optional. Savings and a debit card may meet your needs. The decision depends on whether the extra protection and flexibility are useful to you, and whether you can manage the repayments.
Conclusion
Use a credit card for planned spending when you can clear the balance or have a workable repayment plan within a 0% offer. Purchase protection, rewards and a record of timely repayments can make it useful. For borrowing over a longer period, compare the total cost with other options.
If you need the card to cover a recurring gap between income and spending, the balance and interest can grow despite regular minimum payments. Review that gap before adding more debt.
References
Credit Strategy (Shard Financial Media): Outstanding credit card debt passes £70bn mark, 27 May 2025.
Bankrate: How Credit Card Companies Make Money, 2026. This article describes the US market.
Investopedia: How Do Credit Cards Work?, updated 12 June 2026. This article describes the US market.
